Coldplay concerts-goers usually expect a light show to go along with their music. But the pop/rock band is on to something new lately, turning its audience members into an interactive LED light show.

The technology is called Xyloband, and it has been most notably featured in Coldplay’s “Charlie Brown” music video and at the band’s concerts. These wristbands are embedded with LEDs that are controlled via a radio transmission. Jason Regler, co-owner of RB Concepts, confessed he came up with the idea—ironically enough—while at a Coldplay concert after hearing the line “lights will guide you home” from the song “Fix You.”

The wristbands are controlled from single laptop that’s loaded with Xyloband’s proprietary software, which the RB Concepts company provides with each order. The laptop is then connected through a cable to a transmitter and antenna, which can broadcast a signal to control the wristbands up to 328 yards away. Each wristband has a receiver, which allows data to be sent from the laptop to the wristbands, telling them how and when to flash.

Currently, the wristbands can only be switched on during events using the transmitters, combined with RB Concept’s software. Regler, in an interview, told a story about how one woman who lived near the “Charlie Brown” music video shoot was surprised to find her wristband from a previous Coldplay concert flashing again. Regler believes that if the Xylobands could be activated at home, users would control them during the event—thus ruining the community experience of flashing as one light.

For now geeks can try and replicate the transmission to activate the Xylobands, but according to Regler they might have a bit of trouble cracking the code.